Foitrtiis to joseph ii



(No Model.)

J. F. KESTBR.

BRUSH SPRING FOR DYNAMOS.

I Patented June 4, 1889.

Ill

WITNESSES Z dwv'z l. yawad UNITED STATES PATENT OFFICE.

JESSE F. KESTER, OF TERRE HAUTE, INDIANA, ASSIGNOR OF THREE- FOURTIIS TO JOSEPH H. BRIGGS, OF SAME PLACE.

BRUSH-SPRING FOR DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 404,715, dated June 4, 1889.

Application filed October 29, 1888.

To all whom it may concern.-

Be it known that I, JESSE F. KESTER, of Terre Haute, in the county of V i go and State of Indiana, have invented certain new and useful Improvements in Brush-Springs for Dyna-mo- Eleetric Machines; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form part of this specification.

My invention relates to an improvement in brush-holders for dynan'io-electric machines or motors.

The object of my invention is to provide a cheap, simple, and durable bruslrholder wherein the separate holders of each brush are connected together by a brush-spring, causing the eommutator-brushes to bear upon the commutator with precisely the same tension, and thereby wear the commutator uniformly round and even, and, further, the tension of all the brushes can be changed at will by the brush-spring and an adjustable nut located in plain view and easy of access.

lVith these ends in view my invention consists in certain novel features of construction and combinations of parts, more fully described hereinafter, and particularly pointed out in the claims.

Referring to the accompanying drawings, Figure 1 is a detail end elevation of the commutator, brushes, and bruslrlrolders, the armature-shaft of the machine being shown in section. Fig. 2 is a detail perspective view of the brush-holders detached.

In the drawings, the referencedetter aindieates a commutator mounted upon the armature-shaft Z), and 0 indicates a suitable brushholder support or carrier provided with pins or spindles (l d, projecting laterally and parallel from the same over the commutator. Upon said pins (Z (Z are loosely mounted the brush-holders 9, preferably (although not n ecessarily) two holders on each pin, as shown, and each of said holders is preferably formed of one piece, provided with a longitudinal circular bearing or aperture f, through which a pin d loosely xtends, and a transverse socket Serial No. 289,411. (No model.)

g, through which a commutator-brush h extends, and in which it is secured by one or more thumb-screws "i. As before mentioned, the brush-holders are mounted upon the pins (1 (Z, to rotate so as to throw the brushes to or away from the commutator.

The series of brushes are yieldingly and adjustably secured together by one or more retractive springs j, connected at its opposite ends to yokes or connecting-links 7;, of noncondueting material, and said yokes are loosely secured to arms rigidly secured to the brush-holders and extending from the same in opposite directions and from opposite sides to give an increased leverage. It will thus be seen that the two series of brush-holders are yieldingly secured together, and that the tension of the spring draws the brushes against the commutator with a uniform pressure. The springj is provided with a thumb-nut Z, adjustable on a rod m, upon which the spring is mounted, and by which the tension of the spring is increased or diminished to regulate uniformly the pressure of the brushes upon the commutator.

The brush-holders can be confined upon the pins (Z (Z in any suitable manner to allow ro tation of the holders.

It will be readily seen that all electrical communication between the brush-holders, although they are connected, is cut off by the insulating connecting-links 7c 7r.

The great advantages and utility of the herein-described device will be readily seen and understood by all persons who have had experience with dynamo-electric machines or motors.

lVhat I claim is 1. In a dynamo or motor, a brush-holder support provided with spindles extending from the same parallel with the commutator, brush-holders loosely mounted upon the same to swing transversely to the axis of the com mutator, and brushes carried by the holders to bear upon the commutator, in combination with arms extending from opposite sides of the holders, links of insulating material loosely secured to the arms, and a retractivc spring and adjusting rod and nut connecting the links, for the purpose set forth.

2. In a dynamo or motor, a bruslrholder support, two sets of brush-holders loosely carried by the same, and commutator-brushes carried by the holders, in combination with arms extending from the holders, a pair of insulating-links connecting the arms of each set of holders, and a retractive spring and ten- 1 sion-regulating rod connecting the two links, I

for the purpose set forth.

8. In a dynamo or motor, the combination of a brush-holder support provided with spindles extending parallel with the periphery of the commutator, brush holders loosely mounted upon said spindles and provided,

with transverse sockets, brushes secured in said sockets to bear upon the commutator and swing to or away from the same in planes transverse to its axis, and a retractive spring' connecting the holders to ,yieldin-gly hold the supported by the same parallel with and over and above the commutator to swing in planes transverse to the axis of the same, commutator-brushes carried by the holders, and a retrac'tive spring connecting the holders to yieldingly hold the brushes in engagement with the commutator, as set forth.

6. In a dynamo or motor, the combination of a brush-holder support provided with a pair of spindles extending parallel with and over the commutator, brush-holders, each having a longitudinal bearing loosely embracin g a spindle and a transverse socket, brushes secured in the sockets to swing with the holders to or from the commutator, and a retractive spring connecting the holders to yieldingl y hold the brushes in engagement with the commutator, substantially as described.

In testimony that I claim the foregoing as my-own I affix my signature in presence of two witnesses.

JESSE F. KESTER.

Witnesses: a

CHAS. M. WERLE, HUBERT -E. PEcK. 

